Haraka

haraka.github.io · checked 8 Oct 2026

#25 · Mail Server Software

Visit haraka.github.io ↗ Alternatives Haraka vs Dovecot

How it plugs in

—Public API

NoOpen source

YesFree tier

Signal on Mail Server Software5.7#25 of 34

Haraka is a high-performance, flexible SMTP server written in Node.js.

Pricing

HarakaOpen-source SMTP server · MIT licensed · requires Node.jsFree

As haraka.github.io lists them, checked 8 Oct 2026.

Near it

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Runs on

Web
Windows
Mac
Linux
iOS
Android

Facts

Website: haraka.github.io
Price: Free tier
Free trial: No
Authentication security: The flat-file authentication plugin stores passwords in clear text, and its documentation recommends using auth-encfile to protect credentials.
Integrations: Listed plugins support systems and services including LDAP, Dovecot, Redis, Kafka, MongoDB, SpamAssassin, and Rspamd.
License: Haraka is MIT licensed.
Mail filtering: Haraka can be used as a filtering MTA, with plugins for spam protection and checks such as DNS blocklists.
Not a mail store: Haraka says it is not a mail store, LDA, or IMAP server and is typically used alongside such systems.
Outbound delivery: Haraka includes an outbound mail delivery engine that queues messages marked for relaying.
Plugin architecture: Its modular plugin system lets JavaScript programmers change how the server behaves.
Project stewardship: The website says Haraka was started by Matt Sergeant and is maintained by the Haraka community.
Runtime requirement: Haraka requires Node.js and can be installed through npm, yarn, or pnpm.
Scale: The documentation says Haraka can serve thousands of concurrent connections and deliver thousands of messages per second.
Submission agent: Haraka can run as a message submission agent on port 587 with authentication and DKIM plugins enabled.
Support: The project directs users to its mailing list and GitHub Issues for help.

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